Remove the Subscriptions feature

[jtherrmann]

Overview

I confirmed that each of the following commands shows no output:

# finds all tracked filenames containing "subscription" (case-insensitive)
git ls-tree -r remove-subscriptions --name-only | grep -i subscription

# finds all occurrences of "subscription" (case-insensitive) in tracked files other than the Changelog
git grep -i subscription | grep -v CHANGELOG

We expect these resources to get deleted:

• subscription manager and worker lambdas
• subscriptions dynamodb table
• subscription_id parameter for get jobs api endpoint
• subscriptions api endpoints
• subscriptions-related api schemas

Before merging to test

• Changelog entry.

Verify changes in a sandbox deployment:

• Create a new sandbox deployment (branch off of develop).
• Set user quota for myself.
• Create some subscriptions in the sandbox and let them generate some products.
• Merge remove-subscriptions into subscriptions-removal-sandbox and verify that all expected resources get deleted
• Why does Swagger UI show INVALID for API schema? (see bottom-right corner of page)
• Manually remove the subscription_id field from the Jobs table.

After merging to test

• Verify that all expected resources get deleted
• Verify that Swagger UI shows VALID for API schema (see bottom-right corner of page)
• Manually remove the subscription_id field from the Jobs table.